Cable hoisting and conveying apparatus



Jan. 12 1926.

F. T. DUNHAM CABLE HOISTING AND CONVEYING? APPARATUS 2 Sheets-Sheet 1 INVENTOR i'i'rres/ Tia/Mam BY ATTORNEY Filed Oct. 15. 1924 I J an. 12 ,192s. I

F. T. DUNHAM CABLE HOISTING AND CONVEYING APPARATUS Filed Oct. 15 1924 2 Sheets-Sheet 2' INVENTOR 73/1251 Kim/2am ATTORNEY Patented Jan. 12, 1926.

UNITED STATES PATENT OFFICE.

FORREST T. DUNHAM, OF OAKVILLE, WASHINGTON.

CABLE HOISTING AND CONVEYING APPARATUS.

Application filed October 15, 1924.

a citizen of the United States, residing at Oakville, in the county of Grays Harbor and State of Washington, have invented a certain new and useful Improvement in Cable Hoisting and Conveying Apparatus, of which the following is a specification.

My invention relates to improvements in cable hoisting and conveying apparatus that is adapted for use in hoisting and conveying logs and the object of my invention is to provide a hoisting and conveying apparatus wherein the carriage travels upon the hauling cable and the hoisting block may be raised and lowered by means of said hauling Cable and the hoisting sheaves disposed upon said carriage.

Another object is to provide a cable hoisting and conveying apparatus which embodies a carriage or conveyor constructed in such a manner that the hoisting block may be locked therein or released therefrom when desired.

Another object is to provide a cable hoisting and conveying apparatus arranged in such a manner that the load carried thereby will be caused to automatically lower itself in the event that the haulback line is severed.

Another object is to provide, in combination with a hauling cable, a carriage having sheave means disposed therein and a hoisting block disposed upon said hauling line between said sheave means whereby said block will cause said hauling line to ride upon said sheave means.

A still further object is to provide a cable hoisting and conveying apparatus in which the carriage will drop to the ground in case the hauling cable breaks thereby avoiding any danger of said carriage running by gravity to either end of the cable on which it is mounted and breaking or damaging the spar trees upon which apparatus is mounted.

I accomplish these objects by devices illustrated in the accompanying drawings, wherein Figure 1 is a diagrammatic view showing a hoisting and conveying apparatus constructed in accordance with my invention;

Fig. 2 is a similar View showing the hauling cable as it appears when dragging a load over an obstruction;

Fig. 3 is a similar view showing the sev- Serial No. 743,640.

oral parts in a position they may assume in the event the haulback cable is severed;

Fig. 4 is a view partly in section and partly in side elevation of a carriage and hoisting block constructed in accordance with my invention;

Fig. 5 is a sectional View of the same on line 5, 5 of Fig. 4;

Fig. 6 is a view in side elevation parts being broken away of a modified form of carriage and hoisting block; and

Fig. 7 is a somewhat diagrammatic View of a modification of my invention.

Referring to the drawings, throughout which like reference numerals indicate like parts, in Figs. 1 to 5 inclusive the numeral 10 designates a hauling cable which serves as a combined lifting, hauling and trackcable and 11 designates another cable commonly termed a haulback cable, 12 designates a carriage or conveyor and 13 designates a lifting block arranged to cooperate with the carriage 12.

The carriage 12 is provided at the upper end with one or more sheaves or pulleys let arranged to travel upon the cable 10 and is provided below the sheave l t with two spaced sheaves 15 and 16 between which is a receptacle 17 of bell shape for the block 13, the bottom end of the receptacle 17 is preferably flared, as shown, to assist in guiding the block 13 thereinto.

A sheave 18 is mounted in the block 13 and means, as a hook 20, is provided for attaching it with a load, as a log 22 held within a chocker line 21.

The hauling cable 10 is rigidly secured at one end to the carriage 12, thence passes. around a pulley 23 on a spar tree 24:, thence back through the carriage 12 under sheave 14L, thence around a pulley 25 on another spar tree 26, thence back over sheave 16 in the carriage 12 under sheave 18 in the block 13, thence over sheave 15 in the carriage 12, thence over a pulley 27 on the spar tree 2% and thence to a suitable winding drum or hauling means 28.

The haulback line 11 is secured to the block 13, thence extends to and around a pulley 29 that may be anchored near the spar tree 26, thence over pulleys 30 and 31,

the latter of which is preferably mounted:

on spar tree 24 and thence to the winding drums or hauling means 28.

The spar trees 24 and 26 may be a great distance apart and it often happens that one of said spar trees is on higher ground than the other so that the load is hauled in, either on an upward or a downward incline. The haulback linell may lead over any necessary number of pulleys to a point as far away as it is ever necessary to draw the block 13 and thence extends to and is connected with said block, the haulback line 11 usually being led to one side where it will be out of the way.

In, the operation of an apparatus arranged as above described the carriage is supported on the upper pulley 14. hen slackness or a deflection is permitted in the line that connects to the hauling means 28 and the haulback line is wound in the carriage will be drawn toward the outer spar tree 26 and the hoisting block 13 will be drawn out to the load that is to be hoisted and conveyed. After the hoisting block is made fast to the load a pull maybe exerted on the cable 10, first lifting the load until the block 13 enters the recess 17 in the carriage 12 and then drawing the carriage 12 toward the spar tree 24, the'haulback line 11 being kept taut to hold the loadback and prevent slackness in the hauling cable 10.

If the haulback line 11 is severed the carriage will not run forward or backward at high speed but will descend into a position approximately as shown in. Fig. 3, the movement of the carriage causing a slackness or deflection in the cable 10 that will be taken up by the load thereby lowering the load but will not permit it to drop suddenly to the ground andthat will prevent the carriage from running forward or backward and striking the spar trees and damaging the same.

In apparatus of. this naturethat is in com mon use at the present time where the carriage is supported on a track cable or high line that is ridged with both spar trees and said high line is at an incline, if the haul back line breaks the carriage will crash with terrific force into the inner spar tree thus breaking said spar tree endangering the lives of the workers and wrecking thewhole over head system, which it has taken many days to install. If the incline is toward the outer spar tree the breaking of the hauling line may permit the carriage to crash in the same manner into the outer spar tree.

Any obstruction that causes an excessive pull to be exerted, on the hauling cable 10 will tend to straighten said cable 10 between the pulleys 23 and 25 and raise the load together with the block to a higher elevation. For instance, if a load being hauled in on sagging cables strikes an obstruction, as a hump .in the ground, as shown in Fig. 2, the cable '10 will be drawn tighter thereby taking out the deflection in the cable and lifting the load over said obstruction.

In Fig. 6, Ihave shown a carriage 32 and means block 33 that are similar to'those hereinbefore described except that the sheaves 34 are provided to travel on the cable and a recess 35 in the carriage 3:2 for the reception of the block 33 has, at its rear edge, a ledge 36 arranged to engage beneath the lower edge of the block and support the block against withdrawal from the carriage when a pull is exerted on the haulback line 37. This carriage and block operate in substantially the same manner as those previously described except for the one feature above pointed out.

In Fig. 7 I have shown a modified form of my invention in which I have provided a carriage 40 having an upper sheave 41 and a lower sheave 42 and a block 43 recessed as at 44 to (it over the bottom end of the carriage 40 and having two sheaves 45 and 46. A cable 47 is secured to the carriage 40, thence passes over the pulley 48 on the spar tree 50, thence through the carriage 40 under the pulley 41, thence aroundthe pulley 51 on the spar tree 52 thence under the pulley 46 on the block 44, thence over the pulley 42 in the carriage 40, thence under the pulley 45 on the block 44 and thence over a pulley 53 on the spar tree to the source of power. The operation of this device is similar to the operation of the device previously described, the slacking of the cable 47 permitting the block 43 to be lowered and the tightening or winding of the cable 47 lifting the block 43 and load that may be connected therewith and drawing the carriage toward the spar tree 50.

It will be obvious that in the event that the hauling cable 10 is severed the carriage together with the blockwill fall to the ground which result is desirous for the reason that the apparatus can be repaired and so that the carriage will not damage the spar trees. If the hauling cable or haulback line should be severed in an apparatus of this nature where a high line is used for supporting the carriage and hauling line the carriage would travel upon the high line in the direction of the incline of said highline and would demolish the spar tree that it would strike.

This application is a substitute application for the application filed byme in the United States Patent Ofiice September 2, 1924, Serial No. 735,289.

The foregoing description and accompanying drawings clearly disclose a preferred embodiment of my invention but it will be understood that this disclosure is merely illustrative and that changes may be made therein without departing from-the spirit thereof. 1

lVhat I claim is:

1. A cable hoisting and conveying appa ratus embodying a carriage, a hauling cable mounted on sheaves one end of which is attached to said carriage and the other end of which is attached to suitable hoisting means, said carriage being movably mounted upon said hauling cable and having two sheaves mounted therein on which said hauling cable may travel, a hoisting block movably mounted upon said hauling cable at a point between said two sheaves in said carriage, and a haulback cable attached to said hoisting block.

2. In a hoisting and conveying apparatus, two fixedly spaced pulley blocks, a cable extending around both of said pulley blocks, a carriage having an upper sheave arranged to travel on said cable and having lower sheaves over which said cable passes, a hoisting block suspended on said cable be low said carriage and arranged to be lifted by the tightening of said cable, one end of said cable being connected with said carriage and the other end being connected with a source of power, and haulback means connected to said block.

3. In a hoisting and conveying apparatus, a carriage, sheaves in said carriage, a hoisting block, a sheave in said block, and a cable extending continuously from a source of power over a sheave in said carriage then under a sheave in said block, over another sheave in said carriage, around a fixedly mounted pulley block at a distance from said source of power, under a sheave in said carriage, around another fixedly mounted pulley block thence to said carriage to which it is fixedly secured.

4. In a hoisting and conveying apparatus, a carriage having upper and lower sheaves, a hauling block having a sheave, two spaced supports, pulley blocks on each of said support, a hauling cable secured to said carriage thence passing continuously around a pulley block on one support, under the upper sheave in said carriage, around a pulley block on the other support, over a lower sheave in said carriage, under a sheave in said hauling block over another lower sheave in said car-- riage, and over a second pulley block on said first mentioned support to a source of power, and haulback means for said block and carriage.

5. In a hoisting and conveying apparatus, a carriage having an upper sheave and two spaced lower sheaves and having a block receiving receptacle formed between said lower sheaves, a block, a sheave in said block, two spaced cable supports, pulley blocks on said supports, a cable secured to said carriage and passing continuously around the pulley block on one support, under the upper sheave in said carriage, around the pulley block on the other support, over one lower sheave in said carriage, under the sheave in said block, over the other lower sheave in said carriage, and over a second pulley block on said first named support, and a haulback line connected with said block.

In witness whereof, I hereunto subscribe my name this 10th day of October A. D.

FORREST T. DUNHAM. 

